X-Chat Aqua is a MacOS X IRC client. If you are familiar with XChat for UNIX/GTK+/X Windows, then you will be at home with X-Chat Aqua. X-Chat Aqua uses the IRC engine from XChat and has been designed to look and feel like XChat.

Out of all the Mac IRC clients, this one is easily the most functional. All of the standard IRC fare is there in an interface that makes sense for veterans of the protocol. All of the other IRC clients out there, for OS X, feel crippled in one way or another.